Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    On fixed disks, the upper 2 bits of the 10-bit cylinder number are
    placed in the upper 2 bits of register CL.
 
    On floppy disk drives, an error may result from the drive motor being
    off at the time of the request. The ROM BIOS does not automatically wait
    for the drive to come up to speed before attempting the write operation.
    The requesting program should reset the floppy disk system (Int 13H
    Function 00H) and retry the operation three times before assuming that
    the error results from some other cause.
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